Drum-heater.



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G. B. WANAMAKER.

D'RUM HEATER.

APPLICATION FILED MAYM, 1911.

lgjfju Patented Mar. 12, 1912.

mui-1 A am t como v K25/f: Zi 774314222@ Aff/' which itinay be operated,and a threaded CHARLES 1a. WANAMAKER, or INDIANAPOLIS. 1NDIANA.'AssIGNoR'fro LEEnY fiaANU#4 .UNITED sTATEs PATENT carlton y FACTUBINGCOMPANY, 0F INDIANAPOLIS. INDIANA. A CORPORATION 'OIE INDIANA.

DRUM-HEATER.

Specification of Letters Patent.

Patented l\IIar..-1 2N, .1912.

".fvdnation filed May 11, 1911. Serial No. 626.535.

To all 'whom it may concern:

CJI

-such drum, .the construction being of such character 4that the heatingelement may -be readily withdrawn from the instrument or, if

desired, may be left in the instrument without danger of deteriorationor without .spoiling the tone of the instrument.

The accompanying drawings illustrate my invention las applied to .anordinary snare drum. 1

Figure l is a transverse section of the drum and applied heater; Fig. 2.a partial axial section of the heater element', thetitting means ofwhich it may 1" attached to a4 drum, andthe connecting@ einher by mel nsof which this heating elenient may be connectedto an electriccircuit-faI "'.ln the drawings, 10 indicates a fitting or plate adaptedto be securedwto the exterior Aof the main shell 11 of the drum, andthis vplate carries a sleeve 12 which is internally threaded and hasV anexternal diameter such that it may be readily inserted. into the o1'-dinary vent opening 13 (or a slight enlarge ment Athereof) of the mainbody of the drum.

The heater element. comprises a main body y 15' having a knurled head 1Gby meansof portion 17 adapted to fit the threads of the sleeve 12.Carried by the body 15 but insulated therefrom is a central core 18which passes through an insulating sleeve 1 9.' A heating coil 20 iswrapped around this insulating sleeve and is connected' at one end tothe central core and at the opposite end to the main body.

The fitting for connection to4 an electric circuit comprises an innertube 21 adapted to receive the core of the heating element and an outertube 22 fitting nicely into the receiving end of the main body 15, thebore 0f the main body being slightly tapered and van electric circuit.

the sleeve 2-2 correspondingly tapered. i The l end of the core 1S maybe split so as to form a pair ot spring tongues 1n an ordinary manner soas to insure good electrical conshoved endwisc into the main body 15.

lVhen the heating element is in place nection when the connectingfitting is within a drum, it is, of cours'e, necessary to.

provide means for exhaust of the heated air from the interior of thedrum and'for-l this purpose I perforate the plate 10 `at Vone 0r morepoints- 25 and registering perforations will be made through the body ofthe,v drum, the plate 10, however, forming a! neat externa'l'inish forthese perforations.

It will be noted that the heating element may be readily placed andwithdrawn, and

prising a'fitting plate lvada Y ed to be secured threaded perforationand "if vent perforation registering with a corresponding perforation inthe body of the drum,'and :in-electrical heating element carried by saidfitting plate, said heating element having terminals for connection withan electriccircuit and a threaded main body adapted to engage with thethreaded ting.

2.' A heating attachment for drums comprising a fitting plate having avented flange for attachment to the main bodyof .the drinn, and anelectrical heating element carried by said fittingplate, said heatingelement having terminals for connection with 3. A heating atachmentkfordrums comprising a fitting "p ate having a ange for removable attachmentto the body of the drum and a socket for holding heating element, oneend of said socket being unflanged to portion of the tit ,because of thethreaded connection with the supporting plate, itmay be left in placelto the main body of the dl 1n and having a permit its insertion into andremoval from the drum body, and an electrical heating element removablymounted in said socket;

4. Thefcombination with a drum having a perforated portion,l`l of aheating attachment z' l A' comprising a'ttin f ange covering saiperforated Iportion and attached to the drum and a socket extending throh said perforated portion, 'and an '5j electrlcal heating elementremovably mount- 1 ednsaid socket.'` Y.

5. 'lhecombinton -witha drum having a;

ment l"com rlsmg a fitting plate avng-a 10 perforate range .coveringlsaid openings plate having :Lf-.vented l tion in said flange, and anelectrical heating 4of said openings registering with a perforaelement"removably mounted in said soeket.

In vlWitness whereof, I, have hereunto set my hand and seal atndanapo1is','1ndiana, this 1'5 day-of Apri 1,'A. D. one thousand ninehundred and eleven.

'eurams RWANAMAKER. n.84 I

Wi-tfnessesz' l FRANK A. Falun,- 'AJz'rHUn M. Hoon.

